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-   -   25hz horn for PD2150/2450 (http://www.diyaudio.com/forums/pa-systems/216601-25hz-horn-pd2150-2450-a.html)

soundguf 22nd July 2012 12:01 PM

25hz horn for PD2150/2450
 
Hello

I'm going to start a project using PD2150 or PD 2450 (could be others if you have very good arguments). I would like to have suggestions for horn bins going down to about 25hz and up to about 90hz. Yes they will need "some space". But that is not a problem;).
What i'm hoping for is that one of you experienced guys can and will post me drawn to scale with 1 or 2 folds.
Trying to tell me not to is total waste :)

Have a nice day

Tajzmaj 22nd July 2012 09:15 PM

Only one argument. Go with PD. I'm using PD1850. Actually 32 of them and those are worth single penny. Not cheapest but definitely worth to buy. I'm interesting in project. I might even find plans for TSW124.
Cheers, Taj

mdocod 23rd July 2012 03:36 AM

3 Attachment(s)
I'm not sure how big you had in mind, but I think the PD2450 would do well in a tapped transmission line.... A true horn arrangement for this driver isn't practical IMO. Not enough to gain for the enormous increases in box volume required. The following could fit in a box ~24" x 30" x 60", single fold right down the middle. Easy.

soundguf 24th July 2012 01:22 PM

Quote:

Originally Posted by mdocod (Post 3101201)
I'm not sure how big you had in mind, but I think the PD2450 would do well in a tapped transmission line.... A true horn arrangement for this driver isn't practical IMO. Not enough to gain for the enormous increases in box volume required. The following could fit in a box ~24" x 30" x 60", single fold right down the middle. Easy.

I have the space for much bigger bins. And I think it has to be horn to achieve the goal for spl and dynamic and VERY big to reach the low cutoff. Perhaps the 2150 is a better choice?
Tried earlier to exted different hornboxes. Always with significant improvement in soundquality and extended frequenceresponse.
Now I just want to start with "the beginning" and build it based on the right calculations all the way.

soundguf 16th August 2012 10:32 PM

anyone who can calculate a large bin using pd2150 for me please?

Top Shelf 17th August 2012 01:35 AM

Might want to try" subwoofers" forum

soundguf 18th August 2012 06:39 PM

Thanks :-)

Kindhornman 18th August 2012 06:55 PM

soundguf,
Are you truly trying to build a single horn that goes down to 25hz with a single device as the driver. I don't know what driver you are planning to use but besides the actual diameter of the device this is a fairly simple exercise in design. How advanced a design are you looking for. A simple straight horn isn't hard with straight side, a curved horn would take a bit more to do. I have built some very large horns, not this big, you are talking about a mouth size of almost 12' x 12' at a 1/4 wave length. I hope you don't have any neighbors as they might not like that. The US government made some metal horns that big and used them to knock down buildings..... Yes sound can be a weapon. :eek:

Multiple enclosures would be more practical but then you need multiple drivers to go with them.

soundguf 18th August 2012 09:25 PM

Hello Kindhornman

Thanks for your respons. Yes I realy what to build some large horns. The building I have been using for my earlyer setup. Has already subsidence damage.
But once in a while I will load them on a truck to other locations and have some fun....trying to make music alive again:) (I think mp3 on small bins is killing music) I Like sound "fullsize" and uncompressed.
I am a kind of a newbie in designing horns. So thats why I would like to get some help with the start of this project.....

Kindhornman 19th August 2012 12:08 AM

What do you think that you are going to build something this large out of and move without a crane or forklift? This is going to be very heavy. The bracing would add significant weight to keep the walls of the horn from flexing with the spans you would be looking at.


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